What is already known:
What this study adds:
Improved science and technology has created the opportunity to explore the impacts of different model diagnostic fields as indicators of convection developed in highresolution numerical models. Indication of the success of different diagnostic fields has been discussed (Kain et al. 2008, Sobash et al. 2008). Updraft helicity (UH) has shown a particular ability to identify supercell-like structure in convection allowing model observed locations. UH will be examined to determine the best integration layer over which to calculate UH.
Output of updraft helicity over different layers from the convection allowing 4-km National Severe Storms Laboratory- Weather Research and Forecasting Radar (NSSLWRF) Advanced Research WRF (ARW) from the Spring Experiment 2008 was compared to Storm Prediction Center (SPC) storm reports using contingency tables. Verification measures (Probability of Detection, False Alarm Ratio, Critical Success Index, bias) were calculated from the contingency tables and used to create several visual comparisons. These include Relative Operating Characteristic curves (ROC) (Mason 1982), and Performance Diagrams (Roebber 2008), as a comparison of different depth’s success as a forecast parameter.